avoid retrying to download for FileNotFoundError

[njzjz]

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[codecov]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (bd71277) 71.04% compared to head (a6dfbfe) 57.43%.

❗ Current head a6dfbfe differs from pull request most recent head fd298e2. Consider uploading reports for the commit fd298e2 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #409       +/-   ##
===========================================
- Coverage   71.04%   57.43%   -13.62%     
===========================================
  Files          31       31               
  Lines        3568     3580       +12     
===========================================
- Hits         2535     2056      -479     
- Misses       1033     1524      +491     

Files	Coverage Δ
dpdispatcher/submission.py	87.87% <0.00%> (-0.34%)	⬇️
dpdispatcher/ssh_context.py	78.49% <16.66%> (-1.51%)	⬇️

... and 7 files with indirect coverage changes

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